I know these cards are bad and all, but come on please... You know how many unsportmanlike 15 yard flags are thrown in a single High School Football season? The answer is a bunch. You can late hit a QB, and none of this junk happens to you. It costs your team 15 yards thats it. Period. Soccer refs have way too much power, for what they are doing. Also there are only two folks to control a High School match. AYSO even has three.
Example of too much power: I saw a young lady get a yellow card for dicussing an off side call. She took a corner kick, stepped in 5 yards recieved it back to take a shot and was called off sides. She asked how could she be off, with people on the posts. She was yellow carded for being smarter than the ref.